PBDB Interval

Early Aalenian subage

174.7 - 170.9 Ma

The definition of this interval in the timescale Mesozoic Subages is taken from the following source:

F. M. Gradstein, F. P. Agterberg, J. G. Ogg, J. Hardenbol, P. Van Veen, J. Thierry, and Z. Huang. 1995. A Triassic, Jurassic, and Cretaceous time scale. SEPM Special Publication 54 view

There are intervals in 5 timescales which overlap this one. show

This interval is used in the definition of 146 collections

A total of 1623 collections with 7458 occurrences lie within this time span

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International Chronostratigraphic Timescale			Mesozoic Subages
Quaternary	Holocene	Meghalayan			0
		Northgrippian			0.0042
		Greenlandian			0.0082
	Pleistocene	Late Pleistocene			0.0117
		Chibanian			0.129
		Calabrian			0.774
		Gelasian			1.8
Neogene	Pliocene	Piacenzian			2.58
	Pliocene	Zanclean			3.6
	Miocene	Messinian			5.333
		Tortonian			7.246
		Serravallian			11.63
		Langhian			13.82
		Burdigalian			15.98
		Aquitanian			20.44
Paleogene	Oligocene	Chattian			23.03
	Oligocene	Rupelian			27.82
	Eocene	Priabonian			33.9
		Bartonian			37.71
		Lutetian			41.2
		Ypresian			47.8
	Paleocene	Thanetian			56
		Selandian			59.2
		Danian			61.6
Cretaceous	Late Cretaceous	Maastrichtian	Late Maastrichtian/Early Maastrichtian		66
		Campanian	Late Campanian/Middle Campanian/Early Campanian		72.1
		Santonian	Late Santonian/Middle Santonian/Early Santonian		83.6
		Coniacian	Late Coniacian/Middle Coniacian/Early Coniacian		86.3
		Turonian	Late Turonian/Middle Turonian/Early Turonian		89.8
		Cenomanian	Late Cenomanian/Middle Cenomanian/Early Cenomanian		93.9
	Early Cretaceous	Albian	Late Albian		100.5
			Middle Albian		106.2 *
			Early Albian		109.9 *
		Aptian	Late Aptian		113
		Aptian	Early Aptian		119.5 *
		Barremian	Late Barremian/Early Barremian		121.4
		Hauterivian	Late Hauterivian/Early Hauterivian		125.77
		Valanginian	Late Valanginian/Early Valanginian		132.6
		Berriasian	Late Berriasian		139.8
			Middle Berriasian		140.6 *
			Early Berriasian		142.7 *
Jurassic	Late Jurassic	Tithonian	Late Tithonian	Middle Tithonian	145
		Tithonian	Early Tithonian	Middle Tithonian	146.3 *
		Kimmeridgian	Late Kimmeridgian		149.2
		Kimmeridgian	Early Kimmeridgian		152.2 *
		Oxfordian	Late Oxfordian	Middle Oxfordian/Early Oxfordian	154.8
		Oxfordian		Middle Oxfordian/Early Oxfordian	157.9 *
	Middle Jurassic	Callovian	Late Callovian/Middle Callovian/Early Callovian		161.5
		Bathonian	Late Bathonian/Middle Bathonian/Early Bathonian		165.3
		Bajocian	Late Bajocian		168.2
		Bajocian	Early Bajocian		168.6 *
		Aalenian	Late Aalenian/Middle Aalenian/Early Aalenian		170.9
	Early Jurassic	Toarcian	Late Toarcian		174.7
			Middle Toarcian		180.4 *
			Early Toarcian		182.9 *
		Pliensbachian	Late Pliensbachian/Early Pliensbachian		184.2
		Sinemurian	Late Sinemurian/Early Sinemurian		192.9
		Hettangian	Late Hettangian/Middle Hettangian/Early Hettangian		199.5
Triassic	Late Triassic	Rhaetian			201.4
		Norian	Sevatian		208.5
			Alaunian		213.2 *
			Lacian		216.7 *
		Carnian	Tuvalian		227
		Carnian	Julian		233.4 *
	Middle Triassic	Ladinian	Longobardian		237
		Ladinian	Fassanian		239.7 *
		Anisian	Illyrian		242
			Pelsonian		243.8 *
			Bithynian		244.7 *
			Aegean		245.5 *
	Early Triassic	Olenekian	Spathian		247.2
		Olenekian	Smithian		248.9 *
		Induan	Dienerian		251.2
		Induan	Griesbachian		251.4 *
					251.902